Shocking footage shows the tan lungs of a 52-year-old man who was a chain smoker for 30 years.
The viral video watched more than 25 million times shows medics removing organs from the brain of a dead man on his request to donate them.
But instead of being a healthy pink, they have been heavily tarnished by decades of accumulation of tobacco residue.
The video, dubbed "the best anti-smoking ad" by social media users – shows Dr. Chen Ingengiu and his transplant team examining the lungs at Luxi Hospital in Jiangsu, China.
Dr Chen, who is the lead surgeon for lung transplantation and also vice president of the facility, said the donor was pronounced dead and his organs were donated.
However, doctors quickly realized after harvesting that they would not be able to give the patient the list of patients in need of a waiting list, citing issues such as calcification of the lungs, bullous lung disease, and pulmonary emphysema – all about which are thought to be the result of three decades of smoking.
Using the 'Iyan' hashtag – Mandarin for 'quit smoking' – Dr Chen wrote: 'Many smokers in this country have lungs that look like this.
"Our team has decided to reject these lungs for transplant.
"If you are a heavy smoker, your lungs may not be accepted even if you decide to donate them after death.
"Look at these lungs – do you have the courage to smoke?"
Dr Chen later told local media: "The patient did not undergo a CT scan before his death. He was declared dead brain, and his lungs were donated shortly thereafter.
"Initial tests for the oxygenation index were good, but when we collected the organs, we realized that we would not be able to use them.
"We Chinese people want to smoke. It is impractical to say that we will not accept the lungs of all smokers, but there are strict standards.
"These include the lungs below the age of 60 in a patient who has just been declared medically dead; smaller lung infections and relatively clean X-rays of the chest are also acceptable.
"If the above conditions are met, we would consider transplanting the lungs."
According to the 2018 Cinema Center for Disease Control and Prevention study, 26.6 percent of the country's population over the age of 15 are smokers.
In 2017, the World Health Organization reported that worldwide tobacco use causes 7 million deaths annually.